Centrifugal pump



a E. F. FISHER}. CENTRIFUGAL PUMP.

APPLICATION FILED- MAY 16. I918.

Patented Oct. 28, 1919.

frmqevtfow ERNEST I. FISHER, OFPHILADELPHIA, PENNSYLVANIA.

' CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented Oct. 28.19191 Application filed May 16, 1918. Serial No. 235,034.

To all whom it may concern Be it known that I, ERNEST F. FIsHER, a

citizen of the United States, and resident of Philadelphia, in the count-y of Philadelphia and State of Pennsylvania, have invented new and-useful Improvements in Centrifugal Pumps, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The invention relates to a centrifugal pump which may be used as a compressor for the purpose of'compressing a gas by means of a compressing fluid or whichmay be used as a suction pump for the purpose of exhausting gas from a container.

One of the objects. of the invention is to compress the gas by means of-a compressing fluid, the "fluid being thrown against the gas and driving it through outlet ports by means of an impeller rotated at high speed, the gasbeing drawn into the space where it is acted upon by the liquid by means of the impeller so that the device provides for both suction of the gas from a container and also a compression of the gas.

In the usual methods of using a compressing fluid which acts as a series of pistons, the fluid is thrown through the nozzles carrying the gas with it and then comes to a state of rest after performing its functions. It is then taken up, carried to the center of the impeller and expelled as before thus continuing the cycle but in allowing the compressing fluid to come to a state of rest and then setting it in motion again there is a considerable expenditure of energy which is wasted as it is not directly utilized to compress the gas. To overcome this difficulty and preventv this undue expenditure of energy and eliminate shocks to a great extent, I havedevised a form of centrifugal pump in which the compressing fluid is not permitted to come to a state of rest so as to destroy its momentum but rotates with the impeller and is thrown from it at intervals to compress the gas and is then conducted back to the impeller and travels in the same direction as the impeller in an almost circular path and l is again taken up. by the impeller so that there is no change in direction of the compressing fluid and thus the momentum of the compressing fluid is only decreased to a slight extent. While the energy of the fluid pistons is utilized in compressing the gas,

not all of the inertia of, the fluid has to be overcome in accomplishing the compression.

The mventlon further consists in the several features hereinafter set forth and more particularly defined by claims in the conclusion hereof.

In the drawings:

Figure 1 is a view of the device, parts being broken away and parts being shown in section, the section being taken on the line 1-1 of Fig. 2;

Fig. 2 is a section taken on the-line 2-2 of Fig. 1, parts being broken away;

Fig. 3 is a section taken on the line 33 of Fig. 2;

Fig. 4 is a section taken on the line 44 of Fig. 2.

In Fig. 1 of the drawings, I have shown the compressor applied to a refrigerating apparatus in which the numeral 5 designates the receiver or cooling member. 6 the condensing coils connected with me receiver through a pipe 7 and disposed within a chamber 8 through which the cooling water 9 passes.

The compressor consists of a two part casing 10 and 11 and a rotary impeller 12 mounted on the lower end of a shaft 13 journaled in a housing 14 and connected to a motor 15.

The impeller has a circular base portion 16 provided with radially disposed channels 17 extending from the circumference to a central recess '18 and said base portion is also provided with a plurality of circumferentially arranged recesses 19 which form buck ets for receiving the compressing fluid. The motor in revolving the impeller creates a suction at the central recess 18 and the refrigerant gas is drawn from the receiver 5 up through the outlet 20 and through an inlet 21 in the part 10 of the casing which leads into the recess 18 in the impeller. The

pass through the nozzles 25 and then con- 

